I've got a model of fences and vegetation, normal stuff.... but when you view it from a certain angle, the whole thing disappears, and then reappears as if you look at it from a slightly different angle.... what is going on?!
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What's really odd is that only the base model disappears. The texture used to simulate the light glow does not. It stays the whole time.
The bounding box is automatically calculated during conversion to MDL file.
Does your model include only one light or multiple instances of the light?
That would make me think that you've exceeded the 43690 triangle limit on a given drawcall rather than a bounding box problem. You may need to make another model that uses a renamed copy of your texture sheet and substitute that model for half of your placements.